Audi A5 - Page 29

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The electronic ignition lock E415 has a microswitch
for a normally open contact which connects to
earth when the key is inserted in the ignition lock.
The microswitch is read in directly by the conven-
ience system central control unit J393.
The "key pressed" position is read in by three micro-
switches. All three microswitches connect to earth
when key in the ignition lock is pressed. The
switches are also read in directly by the conven-
ience system central control unit J393.
In the event of a fault, and if for example only 2 of
the 3 microswitches connect to earth when the igni-
tion key is pressed, it is decided by the majority
principle. In this case, the system would decide "key
pressed". However, as feedback is not provided by
all three microswitches, but only by two, a fault is
registered and a warning is indicated.
The lift magnet of the ignition key removal lock is
also energised directly by the convenience system
central control unit. The information which is inter-
changed with the ignition key is transferred in the
form of LIN messages to the electronic ignition lock
and processed by the latter. An electronics device in
the ignition lock thereupon activates the read and
write coil for the data transfer.
System overview
393_008
Convenience system
central
control unit
J393
Convenience CAN bus
Terminal 30 Terminal 30
LIN bus
Te r m in a l 1 5
Terminal 15 - redundancy line 1
Terminal 15 - redundancy line 2
Normally open (NO) contact
Ignition key removal lock solenoid
Electronic
ignition lock module
E415